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chartjs-chart-types

This skill should be used when the user asks "how to create a line chart", "Chart.js bar chart", "pie chart Chart.js", "doughnut chart", "radar chart", "polar area chart", "bubble chart", "scatter chart", "mixed chart", "combo chart", "area chart", "stacked chart", "horizontal bar chart", "Chart.js chart types", "dataset properties", "chart data structure", or needs help implementing specific Chart.js v4.5.1 chart types.

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SKILL.md

Chart.js Chart Types (v4.5.1)

Complete guide to all Chart.js chart types, their configuration, and dataset properties.

Available Chart Types

Type Description Use Case
line Line chart Trends over time
bar Bar chart Comparing categories
pie Pie chart Parts of a whole
doughnut Doughnut chart Parts of a whole with center
radar Radar/spider chart Multivariate data comparison
polarArea Polar area chart Cyclical data
bubble Bubble chart Three dimensions
scatter Scatter plot Correlation analysis

Line Chart

Show trends and changes over time:

javascript
new Chart(ctx, {
  type: 'line',
  data: {
    labels: ['Jan', 'Feb', 'Mar', 'Apr', 'May'],
    datasets: [{
      label: 'Sales',
      data: [65, 59, 80, 81, 56],
      fill: false,
      borderColor: 'rgb(75, 192, 192)',
      tension: 0.1  // 0 = straight lines, 0.4 = curved
    }]
  }
});

Key Line Properties

Property Type Description
tension number Bezier curve tension (0-1)
fill boolean/string Fill area under line
stepped boolean/string Stepped line interpolation
borderDash number[] Dashed line pattern
pointRadius number Data point size
pointStyle string Point shape (circle, rect, triangle, etc.)
spanGaps boolean Connect over null values

Vertical Line Chart

Flip axes with indexAxis:

javascript
options: {
  indexAxis: 'y'  // Vertical line chart
}

Bar Chart

Compare discrete categories:

javascript
new Chart(ctx, {
  type: 'bar',
  data: {
    labels: ['Red', 'Blue', 'Yellow', 'Green'],
    datasets: [{
      label: 'Votes',
      data: [12, 19, 3, 5],
      backgroundColor: [
        'rgba(255, 99, 132, 0.5)',
        'rgba(54, 162, 235, 0.5)',
        'rgba(255, 206, 86, 0.5)',
        'rgba(75, 192, 192, 0.5)'
      ],
      borderWidth: 1
    }]
  },
  options: {
    scales: {
      y: { beginAtZero: true }
    }
  }
});

Key Bar Properties

Property Type Description
barThickness number/'flex' Bar width in pixels
barPercentage number Bar width relative to category (0-1)
categoryPercentage number Category width (0-1)
borderRadius number/object Rounded corners
borderSkipped string Which border to skip

Horizontal Bar Chart

javascript
options: {
  indexAxis: 'y'  // Makes bars horizontal
}

Stacked Bar Chart

javascript
options: {
  scales: {
    x: { stacked: true },
    y: { stacked: true }
  }
}

Pie & Doughnut Charts

Show proportional data:

javascript
// Pie chart
new Chart(ctx, {
  type: 'pie',
  data: {
    labels: ['Red', 'Blue', 'Yellow'],
    datasets: [{
      data: [300, 50, 100],
      backgroundColor: ['#ff6384', '#36a2eb', '#ffce56']
    }]
  }
});

// Doughnut chart
new Chart(ctx, {
  type: 'doughnut',
  data: { /* same as pie */ },
  options: {
    cutout: '50%'  // Size of center hole
  }
});

Key Pie/Doughnut Properties

Property Type Description
cutout number/string Center hole size (doughnut)
rotation number Starting angle (degrees)
circumference number Arc sweep (degrees)
offset number Arc offset on hover
hoverOffset number Offset when hovering

Semi-Circle Chart

javascript
options: {
  rotation: -90,
  circumference: 180
}

Radar Chart

Compare multiple variables across categories:

javascript
new Chart(ctx, {
  type: 'radar',
  data: {
    labels: ['Speed', 'Power', 'Defense', 'Stamina', 'Agility'],
    datasets: [{
      label: 'Player A',
      data: [65, 59, 90, 81, 56],
      fill: true,
      backgroundColor: 'rgba(255, 99, 132, 0.2)',
      borderColor: 'rgb(255, 99, 132)',
      pointBackgroundColor: 'rgb(255, 99, 132)'
    }, {
      label: 'Player B',
      data: [28, 48, 40, 19, 96],
      fill: true,
      backgroundColor: 'rgba(54, 162, 235, 0.2)',
      borderColor: 'rgb(54, 162, 235)'
    }]
  },
  options: {
    scales: {
      r: {
        angleLines: { display: true },
        suggestedMin: 0,
        suggestedMax: 100
      }
    }
  }
});

Polar Area Chart

Like pie but with equal angles, varying radius:

javascript
new Chart(ctx, {
  type: 'polarArea',
  data: {
    labels: ['Red', 'Green', 'Yellow', 'Grey', 'Blue'],
    datasets: [{
      data: [11, 16, 7, 3, 14],
      backgroundColor: [
        'rgba(255, 99, 132, 0.5)',
        'rgba(75, 192, 192, 0.5)',
        'rgba(255, 205, 86, 0.5)',
        'rgba(201, 203, 207, 0.5)',
        'rgba(54, 162, 235, 0.5)'
      ]
    }]
  }
});

Scatter Chart

Show correlation between two variables:

javascript
new Chart(ctx, {
  type: 'scatter',
  data: {
    datasets: [{
      label: 'Data Points',
      data: [
        { x: 10, y: 20 },
        { x: 15, y: 10 },
        { x: 20, y: 30 },
        { x: 25, y: 25 }
      ],
      backgroundColor: 'rgb(255, 99, 132)'
    }]
  },
  options: {
    scales: {
      x: { type: 'linear', position: 'bottom' },
      y: { type: 'linear' }
    }
  }
});

Bubble Chart

Three-dimensional data visualization:

javascript
new Chart(ctx, {
  type: 'bubble',
  data: {
    datasets: [{
      label: 'Dataset',
      data: [
        { x: 20, y: 30, r: 15 },  // r = bubble radius
        { x: 40, y: 10, r: 10 },
        { x: 30, y: 22, r: 25 }
      ],
      backgroundColor: 'rgba(255, 99, 132, 0.5)'
    }]
  },
  options: {
    aspectRatio: 1  // Square chart for bubbles
  }
});

Area Chart

Line chart with filled area:

javascript
new Chart(ctx, {
  type: 'line',
  data: {
    labels: ['Jan', 'Feb', 'Mar', 'Apr', 'May'],
    datasets: [{
      label: 'Revenue',
      data: [65, 59, 80, 81, 56],
      fill: true,  // Enable fill
      backgroundColor: 'rgba(75, 192, 192, 0.2)',
      borderColor: 'rgb(75, 192, 192)'
    }]
  }
});

Fill Options

Value Description
false No fill (default)
true Fill to origin
'origin' Fill to origin
'start' Fill to bottom
'end' Fill to top
'-1' Fill to previous dataset
'+1' Fill to next dataset

Mixed Charts

Combine multiple chart types:

javascript
new Chart(ctx, {
  type: 'bar',  // Base type
  data: {
    labels: ['Jan', 'Feb', 'Mar', 'Apr'],
    datasets: [
      {
        type: 'line',  // Override type for this dataset
        label: 'Trend',
        data: [50, 60, 70, 80],
        borderColor: 'rgb(255, 99, 132)',
        fill: false
      },
      {
        type: 'bar',  // Explicit bar type
        label: 'Sales',
        data: [40, 55, 65, 75],
        backgroundColor: 'rgba(54, 162, 235, 0.5)'
      }
    ]
  }
});

Drawing Order

Control which dataset renders on top:

javascript
datasets: [
  { label: 'Bars', order: 2 },  // Drawn first (behind)
  { label: 'Line', order: 1 }   // Drawn last (on top)
]

Data Structures

Standard Format

javascript
data: {
  labels: ['A', 'B', 'C'],
  datasets: [{
    data: [10, 20, 30]
  }]
}

Object Format

javascript
datasets: [{
  data: [
    { x: 'A', y: 10 },
    { x: 'B', y: 20 },
    { x: 'C', y: 30 }
  ]
}]

Parsed Data Format

javascript
datasets: [{
  data: [
    { id: 'Sales', value: 100 },
    { id: 'Revenue', value: 200 }
  ],
  parsing: {
    xAxisKey: 'id',
    yAxisKey: 'value'
  }
}]

Additional Resources

  • See references/dataset-properties.md for complete property reference
  • See examples/ for working HTML examples:
    • line-area-charts.html - Line charts with tension, area fills, stepped lines
    • bar-charts.html - Vertical, horizontal, stacked bars, and mixed bar+line
    • circular-charts.html - Pie, doughnut, semi-circle gauge, polar area, radar

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